.username_part {
    margin-bottom: 20px;
}

.input-group-addon {
    background: #8BDC97
}

.input-group-addon i {
    color: #fff;
}

.error_message {
    color: red;
    text-align: center;
}

.password_part .input-group-addon {
    padding: 6px 13px;
}

@media screen and (min-width: 768px) {
    #login_module {
        width: 350px;
    }
}